Cylinder-grinder attachment for lathes



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April 13 1926.

-Mm -nnlllll MIU INVENTOR Beg/'alpin E James ATTORNEY 'ATTORNEY April 13 1926.

` B. F. JAMES CYLINDER GRINDER ATTACHMENT FOR LATHES Filed Sept. 5, 1922.

IIll,

2 i e s BETJAMIN F. JAMES, OF' ROCKLA'NI), ONTARIO, CANADA..

CYLINDER- GRINDER ATTACHMENT FOR yLA'IHES.

Application filed September 5, 1922. Serial No. 586,309.

To @ZZ 't0/icm t may concern.'

Be it known that I, BENJAMIN F. JnMns, a citizen of the Dominion of Canada, and resident of Rockland, in the county of Russell and Province of Ontario, Dominion of' tachment of the character stated which willA 'be of simple and inexpensive construction and may be readily attached to lathes of conventional form withoutmaterial alterations therein.

The invention has for another object the provisionof an attachment of the character stated which will be of such construction and operation that the grinding member may be rotated at various speeds in an eccentric member and the latter adjusted so as to vary the throw thereof, as desired.

The invention has for a further object the provision of a lathe attachment of the character stated in which will be includeda rotatable shaft carried in an `eccentric member adjustable in a second eccentric member which is rotatable at a speed different from the speed ofrotation ofthe shaft and which shaft carries the grinding member.

A further object-of the invention resides in the provision of a lathe attachment of the character described which will be of simple and compact construction and in which the adjustable parts maybe readily adjusted and heid in their adjusted positions during oper-l ation of the lathe attachment.

A still further object resides` in the provision of a grinding attachmentfor a lathe in which the power transmitting members of the attachment are supported in a swinging frame so as to automatically adjust the tension of the driving belts' and chains as the parts of the attachment are adjusted to regulate the throw of the eccentricmembers.

The invention has for a still furtherobject the provision of va lathe attachment ofr the character set Vforth which wil-l beof such construction and operation that the eccentric members thereof'may. be readily ad'- justed with respect to one another so as' to regulate the size ofthe arc in whichlthe grinding member travels and tlierebf i `Coinl trol the depth of grinding in the sides of the cylinder in which the tion is being performed.

lVith the foregoing" and other objects in view as will appear as ythe description proceeds, the invention consists in the novel construction, combination and arrangement of co-operating elements as hereinafter more specifically set forth, claimed and shown in grinding operathe accompanying drawings forminga part of the present application, in which:

Fig. 1 is a fragmentary side elevation of a lathe with the improved grinding attachment mounted thereon.

Fig, 2 is an end elevation of the parts shown in Fig. 1. j

Fig. 3 is a transversesection through the lathe and looking toward the attachment mounted thereon, the shaft for the grinding wheelL being shownl in transverse section.

Fig. 4 is a detail longitudinal vertical section substantially on theplane of line 4:--4 of Fig. 3, looking in thedirection indicated by the arrows.

Referring more in detail to the drawings in which similar reference characters designate corresponding parts throughout the sev-l eral views, 10 designates in general the lathe "body or frame supported on the legs 11. The

attachment is mounted on one end' of the lathe body or frame 10, asV will be readily seenby referring to the drawings. main power belt 12 for the lathe is engaged around the belt wheel 13 on the shaft 11i. This shaft 14C also carries a belt wheel, 15 and sprocket wheel 16, the-purpose of which will presently-appear. vA depending bearing frame 17, of substantially U-shape is provided for the shaft 11i and the latter is extended through the upstanding legs of the depending hearing frame 17 on opposite sides of the beltwheels 13and15and the sprocket wheel 16.

A swinging 4bearingL framel 1S of substantially U-sh'aped form is loosely mounted by the rear ends of its legs on the shaft 14 so as to straddle the belt wheels 13 and 15 andthe sprocketiwheel 16, as shownin Fig.

1. Theswingingbearing frame 18`extends 19"a1idacomparatively small belt wheel 26 are mounted on the shaft 21 positionefl transversely inthe'V forward end portion. oi'

The

thegswn'giirg bearing: frame 18, as showirgin i rotate the ffl ha..

Fig. rl`he comparatively smallbelt wheel 2O vis positioned opposite the belt vWheel l5 which is a coniparatively large belt Wheel While the belt Wheel 13 is comparatively small belt wheel. A drive belt 22 connects the comparatively small belt Wheel 2O with the comparatively large belt Wheel 15 in order that the latter may drive the comparatively small belt Wheel and thereby shalt 2l at a greater speed than lll. A drive belt 23 operates around the com tiatirely lll and around a comparatively small belt Wheel 'i on theshalt to rotate the latter at a greater speed than the shalt 2l. The shat't 25 will be later n'icre clearly described. rihe sprocket chain 26 Wels around the sprocket Wheel 1G and also around a corresponding sprocket wheel 2^? on the stub shalt 28 parallel with the shaift 25 and belen' the latter, as shown in Figs. l and 2. The stub shaft :'28 also carries a small sprocket Wheel 29 around which the sprocket chain il() operates to drive the large sprocket reduced speed, the sprocket the shalt Wheel 3l at a chain 30 being operatively engaged around the large sprocket Wheel 3l, as clearly/shown in l and 2.

By referring particularly to `Fig. Ll, it will be seen that the large sprocl-:ct- Wheel 3l is formed on the removable outer head or plug 32 for the main rotatable cylinder' set screws or other suitable members being employed at the outer end ot' the main rotatable cylinder` 353 to retain the remorable outer head or plug 32 in position with the eccentric opening of the removable outer vhead or plug registering with the correspondingl eccentric longitudinal passage 3G ot the main rotatable cylinder B3. rl'his eccentric longitudinal passage 36 e2:- tcnds entirely through the main rotatable cylinder 323 and both this eccentric longitudinal pa J 3G and the eccentric openings are ot circular form. rhe eccentric opening' and eccentric longitudinal passage 8G are ot sullicient diameter'to extend from a point above the longitudinal'center ol" the main rotatable cylinder. 33 and the removable outer head or plug thereof7 to a point near the bottom thereo'l when the main rotatable cylinder 33 in the position shown in the drawings. rthis rfil be more clearly understood as the description proceeds. I

'lhc ends oli' the main rotatable cylinder 33 are mounted for rotation in the supporting bearings 37 which are mounted on the upstanding ends ot' the substantially U- shaped supporting member The supporting legs 40 for the substantially U- shaped supporting member 3S) depend from the main portion thereof and rest upon the longitudinal side members of the lathe bod); or traine l0, as Shown clearly in Figfb,

large lelt .rheel thereby spacing` the main rotatable cylinder 33 a considerable distance above the lathe body or frame l0. Clamping bolts Zll are extended upwardly through the plate elf'l positioned in the lathe body or trame l0 and the upper threaded ends el' the clamping bolts 4l extend tir-Tough the main portion of the substantially vU-shaped supportmember 39 to receive the clamping nuts 43, as shown clearly in Fig. l. Upper bearing members all `for the main rotatable cylinder 33 are extended transversely over the latter and have outturned ends l5 secured upon the s pporting bearings 37 to either side ot the main rotatable cylinder' 38, by suitable securing members 4:6. lt is to be understood that the supporting bearings 37 have arcuate recesses to receive the main rotatable cylinder 33 and the upper bearing' members il are ot arcuate form, so as to provide for proper mounting et the main rotatable cylinder 33, Suitable lubricant cups el? are mounted on the upper bearingl member 44C, as shown in the drawings7 in order that the main rotatable cylinder :lf3 may be properly lubricated at all times for free rotation within the supporting bearings 37 and upper bearing members lll..

Positioned in the eccentric longitudinal passage 36 of the main rotatable cylinder 33 and the eccentric opening 35 ot the removable enter head or plug 32 or" the main rotatable cylinder is the secondary or inner cylinder 48 which is of sufficient .length to project at one end past the removable outer head or plug 32, While the other' end of the secondary or inner cylinder le projects past the corresponding end of the main. rotatable cylinder This may be readily understood by referring to Figs. l and l. The secondary or inner cylinder -l-S has a longitudinal circular passage 49 extending its entire length and arranged eccentrically therein. The grinding wheel operating shalt 25, previously mentioned, extends through and rotates in the longitiulinal circular passage 49. lllhile this grinding wheel operating shaft 25 has been previously mentioned just as a shaft it, Will now be termed the grinding wheel operating shalt 25. A cap 50 is mounted on the extended rear end of the secondary or inner cylinder tl and secured in position by suitable set screws 5L as shown in Figs. l and 2, or by other suitable means. In Fig. 4 the coruparatirely small belt wheel 24, previously mentioned, is shown as being` keyed to the grinding Wheel operating shalt 25 a nd haring an enlarged inner end adjacent the outer tace ot the cap 50. A suitable packing 53' is provided around the grinding wheel operating shaft 25, immediately inuardol the cap 50. A packing 5l is also provided around the grinding Wheel operating shaft 25 at the forward end ot' the sec- 'cylinder ondary or inner cylinder 48. It will alsobe seen by referring to Figs. l, 3 and et that a seomental gear wheel 55 is secured to the forward end of the secondary or inner cylinder 4:8 by suitable securing members 56, the grinding wheel operating shaft pass ing through the segmental gear wheel 55, as shown in Fig. i with a collar 57 located on the grinding wheel operating shaft 25 adjacent the forward face of the segmental gearrwheel 55. teeth 5S extending around a portion of the segmental gear wheel is an adjusting worm screw 59. This adjustablel worin screw 5S) is mounted in suitable bearings 60 on the forward end of the main rotatable B-3 and an operating wheel or head (3l is carried on one projecting end of the adj Listing worm screw 59. It is evident that by means of: the operating wheel or head 5l, the adjusting worm screw 59 may be readily rotated to turn the secondary or inner cylinder Lt8 within the main rotatable cylinder 33 and thereby change the position of the grinding wheel operating shaft 25 with respect to the longitudinal axis of the main rotatable cylinder 33 and s a result of this adjustment vary the throw of eccentric .movement of the grinding wheel operating shaft 25 as the main rotatable cylinder 33 is rotated. An outer shaft section 62 of a smaller diameter than the grinding wheel operating shaft 25 is extended 'forwardly thereof and in alignment with the grinding Wheel operating shaft 25, said outer shaft section 62 being connected with and operated by said grinding wheel operating shaft 25. The grinding wheel 63 of conventional form is suitably mounted on the free forward extremity of the outer shaft section (l2, as shown in Fig. l.

By referringto the drawings, it will be seen that the stub shaft 28 rotates in the upstanding end 38 of the supportingl member 39 at the end of the lathe body or frame l0 and in the supporting bearings 37 carried cn .said upstanding end 88. It will also be evident that the grinding wheel operating` shaft 25 is rotated at a rapid rate of speed while the main rotatable cylinder 33 is ro* tated in the same direction at a considerably reduced speed, this main rotatable cylinder i325 carrying with it the secondary or inner cylinder i8 and the grinding wheel operating shaft 25. lllhile the main rotatable cylinder always rotates in the same circle and the circle in which the secondaryor inner cylinder 48 rotates is always the same within the iirst circle, the path of movement ol" the `grinding wheel operating shaft 25 -with respect to the longitudinal axis of the main rotatable cylinder is determined by the position of the secondary or inner cylinder 4S, within the main rotatable cyl ilaler 'lf his may be understood by refer- Engaged with peripheralv once to Figs; 2, 3 and Li. By referring to Figs. l, 2 and 3 it will be seen that" the de-` pending bearing frame l? includes a long leg 17 at the sidetoward the end of the lathe body or frame 10. rlhe upper end of the long leg 17 is secured to the rearwardly extended portion Gli of one of the upstanding ends 38 of the supporting member 39. Both of the upstanding` ends 38 of the supporting member 39 are extendedv rearward ly and the rearwardly extended portions Get are connected by the rear connecting' plate secured thereto by suitable securing members 66.

lt is believed the complete construction and operation of the lathe attachment should now be apparent from,theforegoing para'- graphs taken in connection with the accompanying drawings without further detailed description. lt may be briefly stated, howver, that whenever' the work `is properly supported opposite the main rotatable cylinder 33 and fed to the grinclina` wheel 63, the attaclnnentmay be a-ojusted and operated toy cause proper action of the grinding wheel 63 on the work.` For example, ifa rapid rotation of the grinding wheel 63 is all that is desired, the secondary or inner cylinder 4S is adjusted through the medium of the adjusting worm screw 59 to support the grinding` wheel operating shaft 25 in the centre of the main rotatable cylinder 33. ln such a case, the main rotatable cylinder 38 willV rotate slowly around p the grinding wheel operatingshaft 25 without havingany eifect upon the latter. If preferred, ythe rotation of the main rotatable cylinder 33 may be discontinued. lWhenever it is desired to cause a movement of the grinding wheel operating shaft 25 in a circle great-er than the circumference of lthel grinding wheel operating shaft 25, the secondary or inner cylinder 4S is turned or adjusted in the main rotatable cylinder 33 unt-il the grinding wheel operating shaft 25 is thrown off of the centre of the main rotatable cylinder a suiiicient distance to cause a movement of the grinding wheel operating shaft 25 in a circle of the desired size concentrically of the longitudinal axis of the main rotatable cylinder' as said grinding wheel operating shaft 25 and said niain rotatable cylinder 3 are rotated at their respective speeds. This double motion of the grinding wheel operating shaft 25 is provided for by simple operation of the ad justing worm screw 59 to position. the ,grinding wheel operating shaft eccentrically ot the main rotatable shaft 33. The double mo-V tion of the grindingl wheel operating shaft 25 is particularly desirable when grinding cylinders of the Ford and other'motors, so as to evenly grind the entire inner walls thereof and increase the efficiency ofoperation of the engine. lt is also evident that the swinging bearing frame 18 permits of adjustment or' the secondary or inner cylinder 48 and the grinding- Wheel operating` shaft 25 Within the main rotatable cylinder and proper operation of the `grindingl wheel operating shaft 25 in its various positions Without breaking' or straining the operative connections between said grinding` Wheel operating shaft 25 and the shaft 2l. he weight of the swinging bearing' frame 1S and the parts mounted therein will assure retaining of the s\./'iiiging bearing `traine 1S in proper position at all times.

lhile the preferred embodiment of the invention has been disclosed, it is to be understood that minor changes in the details of construction, combination and arrangement of co-operating elements may be resorted to Within the scope of what is claimed Without departing from the spirit of the invention.

vWhat I claim as new is:

ln a device of the character statedE a shaft) means for imparting` rotary movement thereto, a rotatable cylinder hai/'ingl an eccentric longitudinal passage therethrougn, a head for said cylinder having an eccentric openingl coincident with said passage, a second cylinder mounted in said eccentric passage and opening and extended beyond said head and haring an eccentric longitudinal passage and receiving` said shaft, a segmental gear on said second cylinder, and means cooperating` with said gear wheel.

In testimony whereof, aiiix my signature.

BENJAli/N F. JAMES. 

